Japan B2B Commercial Maintenance Obligations and Demarcation Rules

Unlike residential leasing—where a broken A/C unit results in an angry tenant calling the landlord to buy them a new one—commercial tenants (offices, restaurants, salons) construct highly customized, heavy-duty interior spaces. Consequently, the legal obligations regarding "Who pays to fix what?" are governed by rigidly complex Business-to-Business (B2B) demarcation contracts.

Disclaimer: This guide provides general legal information for educational purposes only and does not constitute legal advice. B2B demarcation involves serious engineering and liability clauses. Always consult a licensed attorney in Japan. Information last verified: March 2026.

The Shift of Financial Burden in B2B

While Article 606 of the Civil Code states that "A lessor shall assume the obligation to make repairs necessary for the use and profit of the leased property," commercial leases utilize "Freedom of Contract" to shift almost all interior maintenance costs directly onto the tenant.

The Landlord's Responsibility (The Skeleton)

The commercial landlord is generally only financially and operationally responsible for maintaining the "Skeleton" (the core structural and common assets of the high-rise):

• Foundation, exterior walls, and roof waterproofing (Rain leaks)
• Common area elevators, lobby bathrooms, and main electrical breaker rooms
• Main building drainage pipes

The Tenant's Responsibility (Special Clauses)

Through heavily enforced Special Clauses (Tokuyaku), the corporate tenant is made responsible for the maintenance, repair, and replacement of everything inside their exclusive rented area.

• Custom lighting, raised flooring, and partition walls.
• Heavy-duty commercial air conditioning units, specialized grease traps, and industrial exhaust fans.
• Even if an A/C unit was "left behind" (Zanchibutsu) by the previous tenant and the new tenant agreed to use it, the landlord explicitly disclaims all repair obligations. If it breaks, the tenant buys a new one out-of-pocket.

Demarcation: The A, B, C Construction System

In Japanese commercial real estate, interior build-outs, repairs, and demolition are rigidly segregated into three distinct categories based on Who Pays and Who the Contractor Is.

1. A-Works (A Kouji):
   • Paid by the Landlord. Executed by the Landlord's Designated Contractor.
   • These are structural repairs to the core building (e.g., replacing the whole building's elevator bank or repairing exterior cladding).
2. B-Works (B Kouji): [The Source of Massive Disputes]
   • Paid entirely by the Tenant. Executed completely by the Landlord's Designated Contractor.
   • These are modifications happening inside the tenant's rented space, but they deeply affect the building's central core safety systems. Examples include moving ceiling sprinklers, altering central HVAC ducts, or modifying the main electrical distribution board.
   • The Dispute: Because the tenant is forced to use the landlord's monolithic, exclusive contractor, B-Works estimates are notoriously exorbitant and non-competitive. Property Managers must painstakingly manage tenant fury over million-yen B-Works invoices to prevent lease negotiations from collapsing.
3. C-Works (C Kouji):
   • Paid by the Tenant. Executed by the Tenant's chosen Contractor.
   • Purely aesthetic interior work: painting walls, laying proprietary carpet, setting up non-centralized server racks, or installing independent furniture.

The Civil Code Danger: Tenant "Self-Repair Rights"

In 2020, revisions to the Civil Code gave tenants immense new rights to attack landlords who neglect core repairs. Crucially, these new rights apply to massive commercial leases as well.

If the landlord ignores an "A-Works" structural failure—such as a massive roof leak dripping onto a tenant's multi-million-yen server farm—the tenant is no longer legally required to wait patiently.

Under Article 607-2, if the landlord fails to act within a "Reasonable Time" or if there is an "Urgent Emergency," the corporate tenant can legally hire their own emergency contractors to fix the landlord's roof. The terrifying reality for the landlord is that the tenant then possesses a legal "Right to Reimbursement" (Article 608) allowing them to instantly demand full payment for the multi-million yen emergency roof repair, or simply deduct that massive sum from their next month's office rent payment.

Similarly, Article 611 dictates that if a structural failure makes 20% of their office space unusable, their commercial rent is automatically decreased by 20% by law, without needing the landlord's permission.

Therefore, "B2B" does not mean a landlord can ignore repair tickets. Commercial Asset Managers must respond to core structural defect reports instantly, deploying A-Works contractors immediately to prevent tenants from executing hostile, immensely expensive self-repairs.

Landager’s Asset Management suite categorizes maintenance tickets by structural demarcation (A, B, C Works), instantly routing critical A-Works building failures to preferred vendors. This rapid deployment provides a documented paper trail proving the landlord acted within "Reasonable Time," shielding you from devastating corporate rent-deduction lawsuits.

Back to Japan Commercial Real Estate Laws Overview.